Correlation between the Convexity of the Disk Radial Profile and the Hubble Type of the Galaxy

Details Correlation between the Convexity of the Disk Radial Profile and the Hubble Type of the Galaxy Correlation between the Convexity of the Disk Radial Profile and the Hubble Type of the Galaxy

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1121...61s&link_type=abstract

SPACE PLASMA PHYSICS: School of Space Plasma Physics. AIP Conference Proceedings, Volume 1121, pp. 61-70 (2009).

Physics

Plasma Physics

Spiral Galaxies, Accretion And Accretion Disks, Mass And Mass Distribution, Star Formation

Scientific paper

One-dimensional decompositions oflight profiles of galaxies as introduced by Kormendy, where both bulge and disk profiles are fitted by a Sérsic law, are applied to published data. Free parameters of the model are the central brightness, the scale length and the exponential-power number. Thus the radial profile of a galaxy is specified by a superposition of a concave bulge profile and a convex disk profile. Decompositions of numerous profiles of nearby galaxies show a correlation between the Hubble type and bulge or disk exponential numbers. We confirm that with the increase of the morphologic type code of the luminous galaxies (when the mass of the galaxy decreases on average) the profile of the bulge tends to deviate from the de Vaucouleurs ``1/4 law,'' becoming less concave and more compact. We find at the same time that the radial profile of the disk becomes less convex and tends to be more close to a Freeman's ``exponential law.'' The bulge-to disk ratio, however, decreases also along the Hubble sequence. This fact raises the question which process leads to the changes in the shapes of the profiles of the bulge and disk, and relates it with the absolute mass or the bulge-to-disk ratio.

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